// Copyright 2017 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COBALT_LOADER_ORIGIN_H_
#define COBALT_LOADER_ORIGIN_H_

#include <string>

#include "base/optional.h"
#include "googleurl/src/gurl.h"

namespace cobalt {
namespace loader {
// https://html.spec.whatwg.org/multipage/origin.html#concept-origin
class Origin {
 public:
  // To create an opaque origin, use Origin().
  Origin();
  // Initialize an origin to the url's origin.
  // https://url.spec.whatwg.org/#concept-url-origin
  explicit Origin(const GURL& url);
  // https://html.spec.whatwg.org/multipage/origin.html#ascii-serialisation-of-an-origin
  std::string SerializedOrigin() const;
  bool is_opaque() const { return !tuple_; }
  // Only document has an origin and no elements inherit document's origin, so
  // opaque origin comparison can always return false.
  // https://html.spec.whatwg.org/multipage/origin.html#same-origin
  bool operator==(const Origin& rhs) const;
  // Returns true if two origins are different(cross-origin).
  bool operator!=(const Origin& rhs) const { return !(*this == rhs); }

 private:
  struct Tuple {
    bool operator==(const Tuple& rhs) const;

    std::string scheme;
    std::string host;
    std::string port;
  };

  // Helper function for extracting a tuple from a URL.  If a tuple cannot
  // be extracted, then base::nullopt is returned.
  static base::optional<Origin::Tuple> GetTupleFromURL(
      const GURL& url, bool recurse_into_blob_paths);

  base::optional<Tuple> tuple_;
};
}  // namespace loader
}  // namespace cobalt

#endif  // COBALT_LOADER_ORIGIN_H_